Paper for Entry Test Preparation
Physics 1st year Chapter No. 9
Total marks:- 160 Time
allowed 30 minutes
1) Which one of the following can act approximately
as a source of monochromatic light:
a)
Neon lamp b)
Fluorescent tube c)
Sodium lamp d) Non
of all
2) Frequency of red colour as compared to that of
violet colour is:
a)
Equal b)
Smaller c) Greater d) Non of all
3) Monochromatic light means light of same:
a)
Frequency b)
Colour c)
Wavelength d) All
of above
4) The locus of all the points in the same phase of
vibration is called:
a)
Wave packet b) Wave
front c) Wave
number d) Non of all
5) In case of point source of light, shape of wave
front is:
a)
Spherical b)
Cylindrical c)
Plane d)
Non of all
6) Speed of light in vacuum depends upon:
a)
Frequency b)
Wavelength c)
Amplitude d)
Wave number
7) When the source of light is at very large
distance, the shape of wave front is:
a)
Spherical b)
Cylindrical c)
Plane d)
Non of all
8) Laws of reflection and refraction can also be
explained by:
a)
Particle nature of light b)
Quantum nature of light c) Wave
nature of light d) Complex
nature of light
9) A line which represents the direction of travel
of a wave is known as:
a)
Spherical wave front b) Locus c) Ray d) Either
(b) or (c)
10) The property of light which does not change with
ht nature of medium is:
a)
Frequency b)
Amplitude c)
Wavelength d)
None of these
11) The source are said to be coherent if they have:
a)
Same amplitude b) Same
wavelength c) Definite phase relation with each other d)Non of all
12) The terms phase difference and path difference
are:
a)
Same b)
Different c)
Equal d)
Non of lal
13) In case of constructive interference of two
waves, the amplitude of the resultant wave is __ either of the waves:
a)
Greater than b)
Equal to c) Smaller than d) Non of all
14) In Young’s double slit experiment, at the centre
of screen there is formed a:
a)
Dark fringe b)
Bright fringe c) No
fringe at all d) Non
of these
15) The fringe width is TDS experiment can be
increased by decreasing:
a)
Width of slits b)
Wavelength of light c) Slits
separation d) Distance
b/w slits & screen
16) The bending of light when it passes from one
medium to another is known as:
a)
Refraction b)
Interference c)
Polarization d)
Both (b) and (c)
17) Conditions for interference are that the two
sources should be coherent and:
a)
At a far off distance b) Close
together c)
Coinciding d)
Non of all
18) In case of interference fringes:
a)
Energy is destroyed at dark fringes b)
Energy is created at bright fringes
c)
Energy is transferred from dark to bright fringes d) Non of these
19) Newton’s rings are formed due to:
a)
Diffraction b)
Interference c)
Polarization d)
Magnetisation
20) In Newton’s rings apparatus, we also use:
a)
Spectroscope b)
Telescope c)
Microscope d) Any
of these
21) To find wavelength of light by Newton’s ring
experiment, he utilized:
a)
Principle of phase change b) Snell’s
law c) Bragg’s
law d) Both (a)
and (c)
22) Michelson’s interferometer can be used to
measure:
a)
Wavelength of light b)
Intensity of light c)
Amplitude of wave d) Non of all
23) In Michelson’s interferometer, the compensating
plate is used to:
a)
Increase the path in one arm b) Change the amplitude
c)
Equalize the path in both arms d) Non of all
24) Phenomenon of interference and diffraction
support the:
a)
Quantum nature of light b)
Transverse nature of light c) Wave
nature of light d) Complex
nature of light
25) If N is number of lines per meter in a
diffraction grating of length L, then its grating element will be given as:
a)
N/L b)
L/N c)
L/2N d)
2N/L
26) In case of diffraction grating, unit of grating
element is:
a)
Centimetre b)
Kilometre c) As
that of g d) As
that of angle
27) Maximum number of orders available with a
grating is __ grating element:
a)
Independent of b)
Directly proportional to c)
Inversely proportional to d) Non of
these
28) We get light inside a room in day time due to:
a)
Polarization b)
Interference c)
Diffraction d)
All of above
29) The spacing b/w lines of diffraction grating is:
a)
Opaque b) Transparent c) Semi-transparent d) Non of these
30) Diffraction effect is:
a)
More for a round edge b) More for
a sharp edge c) Less for a sharp
edge d) Non of these
31) In Bragg’s equation, Ө is the angle made by the
incident ray with:
a)
Normal of the crystal surface b) The surface of the crystal
c)
Any of above d)
Non of all
32) In Bragg’s equation, ‘d’ represents:
a)
Grating element b) Slit
separation c)
Interplaner spacing d) None of these
33) X-ray diffraction has been used in studying the:
a)
Crystal structure b)
Haemoglobin c)
Structure of DAN d) All of these
34) One of the following is used to measure the
wavelength of X-rays:
a)
Young’s double slit experiment b)
Diffraction grating
c)
Bragg’s law d)
Non of all
35) Light which has the same property in all
directions of vibrations in known as:
a)
Polarized light b)
Monochromatic light c)
Unpolarized light d) Non of all
36) Which of the following cannot be polarized:
a)
Ultraviolet rays b)
Sound waves c) Radio
waves d) X-rays
37) A device which confirms that incident light is a
polarized light is called:
a)
Polarizer b)
Detector c)
Analyzer d)
Non of all
38) By observing the phenomenon of polarization, it
is proved that light waves are;
a)
Extremely short waves b)
Longitudinal waves c) Transverse waves d)
Non of all
39) Wave theory of light is confirmed by:
a)
Interference b)
Diffraction c)
Polarization d)
All of them
40) Polarization of an electromagnetic wave is
determined with:
a)
Electric field b)
Magnetic filed c)
Both (a) and (b) d) Non
of all
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment